# 區域內部類別

class Vehicle {
	 
    int distance; //line n1
 
    Vehicle(int x) {
        this.distance = x;
    }
 
    public void increSpeed(int time) { //line n2
        int timeTravel = time; //line n3
        class Car { 
 
            int value = 0;
 
            public void speed() {
                value = distance / timeTravel; 
                System.out.println("Velocity with new speed " + value + " kmph");
            }
        }
        new Car().speed(); 
    }
}
public class Test {

	public static void main(String[] args) {
		Vehicle v = new Vehicle (100);
		v.increSpeed(60);
	}
}

## What is the result?
**A. Velocity with new speed 1 kmph**
B. A compilation error occurs at line n1.
C. A compilation error occurs at line n2.
D. A compilation error occurs at line n3.
- [x] **Answer: A**

[參考網站](https://magiclen.org/ocpjp-local-inner-class/)

###### tags: `ocpjp`